/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.dx.gen;

import com.android.dx.rop.cst.CstBoolean;
import com.android.dx.rop.cst.CstByte;
import com.android.dx.rop.cst.CstChar;
import com.android.dx.rop.cst.CstDouble;
import com.android.dx.rop.cst.CstFloat;
import com.android.dx.rop.cst.CstInteger;
import com.android.dx.rop.cst.CstKnownNull;
import com.android.dx.rop.cst.CstLong;
import com.android.dx.rop.cst.CstShort;
import com.android.dx.rop.cst.CstString;
import com.android.dx.rop.cst.CstType;
import com.android.dx.rop.cst.TypedConstant;

/**
 * Factory for rop constants.
 */
final class Constants {

	private Constants() {
	}

	/**
	 * Returns a rop constant for the specified value.
	 * 
	 * @param value
	 *            null, a boxed primitive, String, Class, or Type.
	 */
	static TypedConstant getConstant(Object value) {
		if (value == null) {
			return CstKnownNull.THE_ONE;
		} else if (value instanceof Boolean) {
			return CstBoolean.make((Boolean) value);
		} else if (value instanceof Byte) {
			return CstByte.make((Byte) value);
		} else if (value instanceof Character) {
			return CstChar.make((Character) value);
		} else if (value instanceof Double) {
			return CstDouble.make(Double.doubleToLongBits((Double) value));
		} else if (value instanceof Float) {
			return CstFloat.make(Float.floatToIntBits((Float) value));
		} else if (value instanceof Integer) {
			return CstInteger.make((Integer) value);
		} else if (value instanceof Long) {
			return CstLong.make((Long) value);
		} else if (value instanceof Short) {
			return CstShort.make((Short) value);
		} else if (value instanceof String) {
			return new CstString((String) value);
		} else if (value instanceof Class) {
			return new CstType(Type.get((Class<?>) value).ropType);
		} else if (value instanceof Type) {
			return new CstType(((Type) value).ropType);
		} else {
			throw new UnsupportedOperationException("Not a constant: " + value);
		}
	}
}
